<template>
  <div :class="className" :style="{height:height,width:width}" ref="container" />
</template>

<script>
  import * as echarts from 'echarts'
  import { ref , nextTick, onMounted, onBeforeUnmount } from "vue";

const animationDuration = 6000

export default {
  props: {
    className: {
      type: String,
      default: 'chart'
    },
    width: {
      type: String,
      default: '100%'
    },
    height: {
      type: String,
      default: '300px'
    }
  },
  
  setup () {
    let chart = ref(null);
    let container = ref(null);
    
    const initChart = () => {
      chart.value = echarts.init( container.value );
      chart.value.setOption({
        tooltip: {
          trigger: 'axis',
          axisPointer: { // 坐标轴指示器，坐标轴触发有效
            type: 'shadow' // 默认为直线，可选为：'line' | 'shadow'
          }
        },
        grid: {
          top: 10,
          left: '2%',
          right: '2%',
          bottom: '3%',
          containLabel: true
        },
        xAxis: [{
          type: 'category',
          data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'],
          axisTick: {
            alignWithLabel: true
          }
        }],
        yAxis: [{
          type: 'value',
          axisTick: {
            show: false
          }
        }],
        series: [{
          name: 'pageA',
          type: 'bar',
          stack: 'vistors',
          barWidth: '60%',
          data: [79, 52, 200, 334, 390, 330, 220],
          animationDuration
        }, {
          name: 'pageB',
          type: 'bar',
          stack: 'vistors',
          barWidth: '60%',
          data: [80, 52, 200, 334, 390, 330, 220],
          animationDuration
        }, {
          name: 'pageC',
          type: 'bar',
          stack: 'vistors',
          barWidth: '60%',
          data: [30, 52, 200, 334, 390, 330, 220],
          animationDuration
        }]
      })
    }
    
    onMounted( () => {
      nextTick(() => {
        initChart()
      });
    } )
    onBeforeUnmount( () => {
      if (!chart.value) {
        return
      }
      chart.value.dispose()
      chart.value = null
    } )
    
    return {
      container,
      initChart
    }
  }
}
</script>
